5193| 15
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求助:帮我归属一下苯环上的氢,多谢。 |
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发表于 2008-12-24 17:50:57
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发表于 2008-12-29 17:19:40
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发表于 2009-3-30 20:05:37
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发表于 2009-12-9 14:15:20
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